Search Publications
Search for and limits on plume activity on Mimas, Tethys, and Dione with the Cassini Visual Infrared Mapping Spectrometer (VIMS)
Brown, R. H.; Baines, K. H.; Buratti, B. J. +4 more
Cassini Visual Infrared Mapping Spectrometer (VIMS) observations of Mimas, Tethys, and Dione obtained during the nominal and extended missions at large solar phase angles were analyzed to search for plume activity. No forward scattered peaks in the solar phase curves of these satellites were detected. The upper limit on water vapor production for …
Anchoring the Universal Distance Scale Via a Wesenheit Template
Henden, A. A.; Turner, D. G.; Majaess, D. J. +2 more
A VI Wesenheit diagram featuring SX Phoenicis, δ Scuti, RR Lyrae, and type II and classical Cepheid variables is calibrated by means of geometric-based distances inferred from HST, Hipparcos, and VLBA observations (n = 30). The distance to a target population follows from the offset between the observed Wesenheit magnitudes and the calibrated temp…
Lithological mapping of central part of Mare Moscoviense using Chandrayaan-1 Hyperspectral Imager (HySI) data
Bhattacharya, Satadru; Chauhan, Prakash; Ajai +2 more
We conducted spectral analysis of central region of the Mare Moscoviense area on the far side of the Moon using the Hyperspectral Imager (HySI) data from the Chandrayaan-1 mission in an effort to identify and map the major lithological units present in the area. Various spectral band parameters, namely, band curvature, band tilt and band strength …
An Hα Nuclear Spiral Structure in the E0 Active Galaxy Arp 102B
Robinson, Andrew; Marconi, Alessandro; Axon, David J. +5 more
We report the discovery of a two-armed mini-spiral structure within the inner kiloparsec of the E0 LINER/Seyfert 1 galaxy Arp 102B. The arms are observed in Hα emission and located east and west of the nucleus, extending up to ≈1 kpc from it. We use narrow-band imaging from the Hubble Space Telescope Advanced Camera for Surveys, in combination wit…
IRAS 17423-1755 (Hen 3-1475) Revisited: An O-rich High-mass Post-asymptotic Giant Branch Star
García-Lario, P.; Manteiga, M.; Ulla, A. +2 more
The high-resolution (R ~ 600) Spitzer/IRS spectrum of the bipolar protoplanetary nebula (PN) IRAS 17423-1755 is presented in order to clarify the dominant chemistry (C-rich versus O-rich) of its circumstellar envelope as well as to constrain its evolutionary stage. The high-quality Spitzer/IRS spectrum shows weak 9.7 µm absorption from amorp…
Modeling of the turbulent plasma sheet during quiet geomagnetic conditions
Stepanova, M.; Antonova, E. E.
Recent studies have shown the importance of turbulent processes in the Earth magnetosphere dynamics, including the plasma sheet stability. In this study, turbulent eddy-diffusion coefficients were derived using the Cluster satellite data. The corresponding values of dawn-dusk electric field potential were obtained from the SuperDarn measurements. …
Application of vector spherical harmonics for kinematic analysis of stars from zonal catalogues
Tsvetkov, A. S.; Vityazev, V. V.
We solve the problem on a kinematic analysis of the three-dimensional velocity field of stars from zonal catalogues, i.e., catalogues in which the stars are presented at all right ascensions in some declination zones. We have constructed a system of vector spherical harmonics with the properties of completeness and orthogonality for a chosen decli…
Observational evidence of alpha-particle capture at Mars
Fedorov, A.; Barabash, S.; Futaana, Y. +3 more
Solar wind alpha-particles are suggested to be the most important source of helium in the Martian atmosphere. Recent hybrid simulations show that as much as 30% of the alpha-particles passing through the planetary cross section can be lost from the solar wind due to charge-exchange processes associated with the Mars/solar wind interaction. We use …
Observations of Five-minute Solar Oscillations in the Corona Using the Extreme Ultraviolet Spectrophotometer (ESP) On Board the Solar Dynamics Observatory Extreme Ultraviolet Variability Experiment (SDO/EVE)
Kosovichev, A. G.; Didkovsky, L.; Judge, D. +2 more
We report on the detection of oscillations in the corona in the frequency range corresponding to five-minute acoustic modes of the Sun. The oscillations have been observed using soft X-ray measurements from the Extreme Ultraviolet Spectrophotometer (ESP) of the Extreme Ultraviolet Variability Experiment on board the Solar Dynamics Observatory. The…
Comparison of three methods for the estimation of cross-shock electric potential using Cluster data
Balikhin, M. A.; Dimmock, A. P.; Hobara, Y.
Cluster four point measurements provide a comprehensive dataset for the separation of temporal and spatial variations, which is crucial for the calculation of the cross shock electrostatic potential using electric field measurements. While Cluster is probably the most suited among present and past spacecraft missions to provide such a separation a…